用地球化学特征判别川北含铀砂岩

DISTINGUISHMENT OF URANIUM-BEARING SANDSTONE BY THE GEOCHEMICAL CHARACTERISTICS IN NORTHERN SICHUAN

文章阐述了川北砂岩型铀矿床的地球化学特征。根据能谱测量，用Ｕ，Ｔｈ，Ｋ元素的丰度和比值，获得铀富集的有利条件、不利条件。通过伽马能谱法（测Ｕ，Ｔｈ，Ｋ）和Ｘ射线荧光法（测Ａｓ，Ｂａ），区分含铀浅色砂岩和不含铀浅色砂岩，区分红色砂岩（红色泥岩）与浅色砂岩，缩小川北砂岩找铀矿的范围。

Expounding geochemical characteristics of sandstone-type uranium deposits in northern Sichuan,this paper demonstrates the favourable and unfavourable conditions for enrichment of uranium on the basis of element abundances and ratios of U,Th and K measured by the gamma-ray spectroscopy surveying. The differences between uranium-bearing and non-uranium sandstones and between red sandstone (claystone) and greenish sandstone can be determined by the gamma-ray spectroscopy (measuring U,Th and K) and XRF analysis (measuring As and Ba). Therefore, the prospecting of the sandstone-type uranium deposits in northern Sichuan can be concentrated in a certain ranse.